https://newatlas.com/aircraft/hermeus-chimera-hypersonic-test/
Turbojet to hypersonic ramjet: Hybrid Chimera engine shows its range
Jan 24, 2023 - Atlanta company Hermeus has its sights set on Mach 4 next year, to beat the Mach 3.3 benchmark set by the SR-71 Blackbird way back in 1976. Watch its Chimera...
chimera engineturbojethypersonicramjethybrid